EP1081493A1 - Détecteur de gaz à enveloppe antidéflagrante - Google Patents

Détecteur de gaz à enveloppe antidéflagrante Download PDF

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Publication number
EP1081493A1
EP1081493A1 EP99116991A EP99116991A EP1081493A1 EP 1081493 A1 EP1081493 A1 EP 1081493A1 EP 99116991 A EP99116991 A EP 99116991A EP 99116991 A EP99116991 A EP 99116991A EP 1081493 A1 EP1081493 A1 EP 1081493A1
Authority
EP
European Patent Office
Prior art keywords
gas detector
detector according
metal fiber
fiber fleece
support grid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99116991A
Other languages
German (de)
English (en)
Other versions
EP1081493B1 (fr
Inventor
Rolf Pleisch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Schweiz AG
Original Assignee
Siemens Building Technologies AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Building Technologies AG filed Critical Siemens Building Technologies AG
Priority to ES99116991T priority Critical patent/ES2276496T3/es
Priority to AT99116991T priority patent/ATE344453T1/de
Priority to EP99116991A priority patent/EP1081493B1/fr
Priority to DE59913961T priority patent/DE59913961D1/de
Priority to DK99116991T priority patent/DK1081493T3/da
Priority to PT99116991T priority patent/PT1081493E/pt
Publication of EP1081493A1 publication Critical patent/EP1081493A1/fr
Application granted granted Critical
Publication of EP1081493B1 publication Critical patent/EP1081493B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment

Definitions

  • the present invention relates to a gas detector with pressure encapsulation for explosion protection, with a sensor housing containing a sensor and with a flame arrester Housing cover to shield the sensor from the environment and to enable it a gas exchange with this.
  • thermocouples Today, either electrically heated thermocouples (pellistors) are widely used as sensors. or metal oxide semiconductors or electrochemical sensors used, with the Thermocouples and the metal oxide semiconductors the working temperature in a temperature range is in which the ignition temperature of the gases to be detected (ether and acetaldehyde 180 ° C, gasoline and diesel fuel 220-300 °, acetylene 305 °, etc.) already far exceeded is. For this reason, measures must be taken to prevent that the gas detectors ignite the gases they warn of being present should. This type of protection is known as Ex-d. In addition, such gas detectors must be above also meet certain requirements regarding test pressure.
  • the flame arresters used today are filter disks made of a metallic sintered material such as Cr-Ni steel with a pore size of about 30-40 ⁇ m, which, however, is detectable for certain toxic traces, even in slight traces Gases such as chlorine and ammonia do not because of the strong adsorption effect can be applied. Because of the small signals and the long exchange times the sintered materials are omitted today, but what the use of the concerned Gas detectors impossible in hazardous areas.
  • This object is achieved in that the housing cover by a Filter made of metal fiber fleece and a support grid is formed.
  • a first preferred embodiment of the gas detector according to the invention is characterized in that that the metal fiber fleece is made of chrome-nickel steel.
  • a second preferred Embodiment is characterized in that the support grid made of chrome-nickel steel wire consists.
  • the gas grid is arranged on the outside of the housing cover and bordered together with the metal fiber fleece by a ring.
  • a further preferred embodiment of the gas detector according to the invention is thereby characterized in that an additional support grid is integrated in the metal fiber fleece.
  • the protective grille and the metal fiber fleece are poured into the ring mentioned, glued in place or injected.
  • the ring with the housing cover is pressed into the housing or glued in.
  • the ring and the housing part carrying it preferably consist of PPO NORYL.
  • the metal fiber fleece has a thickness of 1 mm and a porosity of 50 ⁇ m and that Support grid is made of a square mesh with a thickness of almost 1 mm and one Mesh size from 0.5 to 0.7 mm.
  • Fig. 1 shows a schematic section through the sensor housing of a gas detector, which has a pressure-resistant detector housing made of aluminum, not shown, in which the detector electronics is installed and which has a nozzle 1, into which the sensor housing 2 is screwed.
  • the sensor housing 2 has a lower part 3 screwed into the socket 1 and an upper part 4 screwed to it, the latter also being referred to as a protective cap.
  • An electrochemical gas sensor 5 for detecting toxic gases such as CO, CO 2 , NO, HCl, NH 8 , NO 2 , or Cl 2 is arranged between the lower part 3 and the upper part 4.
  • the gas detector as such and the sensor 5 are not the subject of the present application and are therefore not described in detail here.
  • the upper housing part 4 has an opening on its end face protruding from the gas detector 6 to allow access of gas from the outside to the gas sensor 5.
  • the opening 6 is characterized by a flame arrester 7 to prevent flames from flashing over covered the interior of the sensor housing 2 to the outside.
  • Fig. 2 shows a section through the flame arrester 7, which also the sensor 5 in front Forms protective cover and forms a diffusion barrier, but it does of course the ability of the gas detector to detect low concentrations of must not adversely affect toxic gases.
  • the flame arrester 7 is composed of two Layers built up, the layer facing the sensor 5 by a metal fiber fleece 8 with an integrated finer support grid 9 on the sensor side and the outside facing layer is formed by a coarse support grid 10.
  • the metal fiber fleece 8 and that coarse protective grids 10 are both by round plates with a diameter of about 25 mm formed, which are surrounded on the outside by a ring 11.
  • Both the sensor housing 1 and the ring 11 are also made of PPO Noryl.
  • the metal fiber fleece 8 and both protective grids 9 and 10 each consist of chrome-nickel steel 1.4404; the metal fiber fleece 8 has a porosity (pore size) of 50 microns and a thickness of 1.0 mm.
  • the metal fiber fleece 8 is a modification to powder metallurgy for filter purposes Fibers manufactured with thicknesses from 4 ⁇ m to 100 ⁇ m and an average length of 25 mm Layered to a so-called tangled fiber fleece in a uniform thickness and then sintered and be rolled. Due to the very high porosity of up to 80%, that is in comparison the metal fiber fleece produced in this way has a very large sum of the pore cross sections an extraordinarily high flow rate.
  • the diameter range of the fibers is very uniform, so that the pore size distribution is also very narrow. This fact ensures an optimal one Ratio of filter fineness to flowability.
  • the coarse protective grid 10 is a square mesh with a thickness of 0.8 mm; the Wire diameter is 0.4 mm and the mesh size is 0.63 mm.
  • Support grid 10 and metal fiber fleece 8 are poured into the ring 11, glued or injected, and the ring 11 with the metal fiber fleece 8 and the support grid 10, ie the flame arrester 7, is in the upper part of the housing 4 pressed or glued.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Cable Accessories (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
EP99116991A 1999-08-28 1999-08-28 Détecteur de gaz à enveloppe antidéflagrante Expired - Lifetime EP1081493B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
ES99116991T ES2276496T3 (es) 1999-08-28 1999-08-28 Detector de gas con envoltura antideflagracion.
AT99116991T ATE344453T1 (de) 1999-08-28 1999-08-28 Gasmelder mit druckkapselung für explosionsschutz
EP99116991A EP1081493B1 (fr) 1999-08-28 1999-08-28 Détecteur de gaz à enveloppe antidéflagrante
DE59913961T DE59913961D1 (de) 1999-08-28 1999-08-28 Gasmelder mit Druckkapselung für Explosionsschutz
DK99116991T DK1081493T3 (da) 1999-08-28 1999-08-28 Gasdetektor med trykindkapsling til eksplosionsbeskyttelse
PT99116991T PT1081493E (pt) 1999-08-28 1999-08-28 Detector de gás com encapsulamento a pressão para protecção antideflagrante

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99116991A EP1081493B1 (fr) 1999-08-28 1999-08-28 Détecteur de gaz à enveloppe antidéflagrante

Publications (2)

Publication Number Publication Date
EP1081493A1 true EP1081493A1 (fr) 2001-03-07
EP1081493B1 EP1081493B1 (fr) 2006-11-02

Family

ID=8238887

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99116991A Expired - Lifetime EP1081493B1 (fr) 1999-08-28 1999-08-28 Détecteur de gaz à enveloppe antidéflagrante

Country Status (6)

Country Link
EP (1) EP1081493B1 (fr)
AT (1) ATE344453T1 (fr)
DE (1) DE59913961D1 (fr)
DK (1) DK1081493T3 (fr)
ES (1) ES2276496T3 (fr)
PT (1) PT1081493E (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009007279A1 (de) * 2009-02-03 2010-08-19 Dräger Safety AG & Co. KGaA Explosionsgeschützter Gassensor ohne druckfeste Kapselung
CN102967627A (zh) * 2012-10-19 2013-03-13 中国船舶重工集团公司第七一八研究所 催化式氢气传感器
WO2013190262A1 (fr) * 2012-06-19 2013-12-27 Crowcon Detection Instruments Limited Capteur de gaz comportant une barrière résistante au feu
DE102014116149A1 (de) 2014-11-06 2016-05-12 R. Stahl Schaltgeräte GmbH Flammenschutzfilter aus einer Anzahl von Schichtenfolgen sowie Anordnungen von Flammenschutzfiltern und deren Verwendung
CN106248884A (zh) * 2016-08-30 2016-12-21 徐州中矿消防安全技术装备有限公司 一种氧气检测外壳保护装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3476517A (en) * 1965-11-22 1969-11-04 Automation Ind Inc Combustible gas detecting device
DE2035173A1 (de) * 1969-07-15 1971-04-08 Dunlop Co Ltd Schutzvorrichtung
EP0016351A1 (fr) * 1979-03-16 1980-10-01 Cerberus Ag Détecteur de gaz à utiliser dans un milieu menacé par des explosions
DE3810409A1 (de) * 1987-07-20 1989-02-02 Karl Marx Stadt Energie Umhuellung von beheizten gasanzeigenden sensoren

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3476517A (en) * 1965-11-22 1969-11-04 Automation Ind Inc Combustible gas detecting device
DE2035173A1 (de) * 1969-07-15 1971-04-08 Dunlop Co Ltd Schutzvorrichtung
EP0016351A1 (fr) * 1979-03-16 1980-10-01 Cerberus Ag Détecteur de gaz à utiliser dans un milieu menacé par des explosions
DE3810409A1 (de) * 1987-07-20 1989-02-02 Karl Marx Stadt Energie Umhuellung von beheizten gasanzeigenden sensoren

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009007279A1 (de) * 2009-02-03 2010-08-19 Dräger Safety AG & Co. KGaA Explosionsgeschützter Gassensor ohne druckfeste Kapselung
US8381576B2 (en) 2009-02-03 2013-02-26 Dräger Safety AG & Co. KGaA Explosion-proof gas sensor without pressure-proof housing
WO2013190262A1 (fr) * 2012-06-19 2013-12-27 Crowcon Detection Instruments Limited Capteur de gaz comportant une barrière résistante au feu
CN102967627A (zh) * 2012-10-19 2013-03-13 中国船舶重工集团公司第七一八研究所 催化式氢气传感器
CN102967627B (zh) * 2012-10-19 2014-12-03 中国船舶重工集团公司第七一八研究所 催化式氢气传感器
DE102014116149A1 (de) 2014-11-06 2016-05-12 R. Stahl Schaltgeräte GmbH Flammenschutzfilter aus einer Anzahl von Schichtenfolgen sowie Anordnungen von Flammenschutzfiltern und deren Verwendung
WO2016070874A1 (fr) 2014-11-06 2016-05-12 R. Stahl Schaltgeräte GmbH Filtre pare-flamme constitué d'un certain nombre de séries de couches et agencements de filtres pare-flamme et leur utilisation
US10537760B2 (en) 2014-11-06 2020-01-21 R. Stahl Schaltgeraete Gmbh Flame-guard filter composed of a number of layer sequences, and arrangements of flame-guard filters and their use
CN106248884A (zh) * 2016-08-30 2016-12-21 徐州中矿消防安全技术装备有限公司 一种氧气检测外壳保护装置
CN106248884B (zh) * 2016-08-30 2018-04-24 徐州中矿消防安全技术装备有限公司 一种氧气检测外壳保护装置

Also Published As

Publication number Publication date
DK1081493T3 (da) 2007-02-19
ATE344453T1 (de) 2006-11-15
EP1081493B1 (fr) 2006-11-02
PT1081493E (pt) 2007-02-28
DE59913961D1 (de) 2006-12-14
ES2276496T3 (es) 2007-06-16

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